Oh, how we love Mariah!
Nick revealed Mariah's tradition when asked during an interview with Good Morning America how his famous wife had marked her (whisper) 44th birthday on 27 March.
"You're going to get me in trouble!" laughed Nick. "She doesn't have birthdays. She celebrates the year she appeared. She has anniversaries of that date."
Okay, so how did she celebrate her anniversary? By visiting the happiest place on earth!
"We went to Disney World," said Nick. "Obviously [with two young kids], that's a huge thing in our household. We go to Disneyworld every opportunity we get. It was good fun down there."
Nick and Mariah are parents to twins Moroccan and Monroe, two.
As well as celebrating at Disney, Nick also gifted Mariah with a gorgeous floating butterfly diamond bracelet. Lucky lady!
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